Hawkshroud Yellow vs Sun Yellow

How close are they?

ΔE 9.2, close: similar, with a visible difference side by side. Sun Yellow is more saturated than Hawkshroud Yellow.

Can I use Sun Yellow instead of Hawkshroud Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Sun Yellow is more saturated than Hawkshroud Yellow.

Can I use Hawkshroud Yellow instead of Sun Yellow?

The same difference applies the other way round: Hawkshroud Yellow is more muted.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.